package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import com.sun.imageio.plugins.jpeg.JPEG;
import lombok.extern.slf4j.Slf4j;
import org.apache.coyote.Response;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.*;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

@RequestMapping("/common")
@RestController
@Slf4j
public class CommonController {
    @Value("${reggie.path}")
    private String basePath;
    //文件上传
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) {
        //file是一个临时文件，需要转存到指定位置，否则本次请求完成后临时文件会删除
        //获取文件的原始文件名, 通过原始文件名获取文件后缀
        String originFileName = file.getOriginalFilename();
        int index = originFileName.lastIndexOf(".");
        String substring = originFileName.substring(index);
        //通过UUID重新声明文件名,文件名称重复造成文件覆盖
        String fileName = UUID.randomUUID().toString() + substring;
        //创建文件存放目录
        //如果目录不存在创建它
        File dir = new File(basePath);
        if (!dir.exists()) {
            dir.mkdirs();
        }
        //将上传的临时文件转存到指定位置
        try {
            file.transferTo(new File(basePath + fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fileName);
    }
    //文件下载方法
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        try {
            //输入流，通过输入流读取文件内容
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));

            //输出流，通过输出流将文件写回浏览器
            ServletOutputStream outputStream = response.getOutputStream();

            response.setContentType("image/jpeg");

            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes)) != -1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }

            //关闭资源
            outputStream.close();
            fileInputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
//    public void download(String fileName,HttpServletResponse response) {
//        log.info("文件下载...");
//        try {
//            //定义输入流，通过输入流读取文件内容
//            FileInputStream fileInputStream = new FileInputStream(new File(basePath+fileName));
//            //通过response对象，获取到输出流
//            ServletOutputStream outputStream = response.getOutputStream();
//            //通过response对象设置响应数据格式(image/jpeg)
//            response.setContentType("image/jpeg");
//            //通过输入流读取文件数据，然后通过上述的输出流写回浏览器
//            int len = 0;
//            byte[] bytes = new byte[1024];
//            while ((len = fileInputStream.read(bytes)) != -1) {
//                outputStream.write(bytes,0,len);
//                outputStream.flush();
//            }
//            //关闭资源
//            outputStream.close();
//            fileInputStream.close();
//        } catch (Exception e) {
//            e.printStackTrace();
//        }
//    }
}
